Recently, it has been recognized that an effect akin to the spin-Rashba (SR) in two-dimensional electron systems (2DES) arises due to the coupling between the atomic orbital angular momentum \({\bf L}\)  and the crystal wave-vector \({\bf k}\)  [1]}, [2]}, [3]}, [4]}. For materials having electronic states with non-vanishing \({\bf L}\)  close to the Fermi level, an intrinsic crystalline potential or an applied electric field that break spatial inversion can yield non-local odd-parity matrix elements among distinct atomic orbitals.
The resulting orbital Rashba effect (ORE) [1]}, [2]}, [3]}, [4]}, in analogy with the spin Rashba effect (SRE), confers chirality to the electronic states at the Fermi level, that acquire a momentum-dependent orbital texture [9]}, [3]}, [11]}, [12]}, [4]}.
